From fd3b1a0e32964436a5259e073857e0c4e2110122 Mon Sep 17 00:00:00 2001
From: David 'Digit' Turner <digit@android.com>
Date: Mon, 10 May 2010 23:47:54 -0700
Subject: Upstream: add qemu_fdatasync()

Change-Id: I232b9c4df372e1fded97694fffcd72ef9ea113c4
---
 cutils.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'cutils.c')

diff --git a/cutils.c b/cutils.c
index ffe5c71..2365e68 100644
--- a/cutils.c
+++ b/cutils.c
@@ -115,6 +115,22 @@ int qemu_fls(int i)
     return 32 - clz32(i);
 }
 
+/*
+ * Make sure data goes on disk, but if possible do not bother to
+ * write out the inode just for timestamp updates.
+ *
+ * Unfortunately even in 2009 many operating systems do not support
+ * fdatasync and have to fall back to fsync.
+ */
+int qemu_fdatasync(int fd)
+{
+#ifdef CONFIG_FDATASYNC
+    return fdatasync(fd);
+#else
+    return fsync(fd);
+#endif
+}
+
 /* io vectors */
 
 void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)
-- 
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